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How can I calculate the "Beta-factor" betw. 2 stocks

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  • How can I calculate the "Beta-factor" betw. 2 stocks

    Hey,

    Since I couldn't find anything with the search function, I took the freedom to ask:

    Is there an EFS which calculates the "beta" between 2 stocks over a given timeperiod?

    Usually the beta is:

    Beta measures stock price volatility relative to the overall stock market. We use the S&P 500 as a proxy for the market and we automatically define its Beta as being 1.00. A higher beta indicates that a stock is relatively volatile while a lower beta indicates more stability. A stock with a Beta of 0.90 would, on average, be expected to rise or fall only 90% as much as the market. So if the market dropped 1.0%, such a stock might rise or fall 0.9% On the other hand, a stock with a Beta of 1.10 would, on average, rise or fall 10% more than the market. So a 1.0% market move, up or down, should spur a 1.1% move for the stock.


    Since I do know that beta is the slope of a linear regression trendline I would like to calculate it by:

    Beta = ( covariance(stock1stock2) ) / variance (stock1)

    Thanks for any suggestions,

    Ptrading.
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